Light emitting device

ABSTRACT

A light emitting device can be characterized as including a light emitting diode configured to emit light and a phosphor configured to change a wavelength of the light. The phosphor substantially covers at least a portion of the light emitting diode. The phosphor includes a compound having a host material. Divalent copper ions and oxygen are components of the host material.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of U.S. patent application Ser. No.12/098,263, filed Apr. 4, 2008, which is a continuation of U.S.application Ser. No. 11/024,702, filed Dec. 30, 2004, now U.S. Pat. No.7,554,129, and also claims priority of Korean Patent Application No.2004-042396, filed Jun. 10, 2004, the contents of which are incorporatedherein by reference in their entirety.

FIELD OF THE INVENTION

The invention relates to light emitting devices and more particularly tolight emitting devices including at least one light-emitting diode andphosphor, the phosphor including is lead and/or copper doped chemicalcompounds and converting the wavelength of light.

BACKGROUND OF THE INVENTION

Light emitting devices (LEDs), which used to be used for electronicdevices, are now used for automobiles and illumination products. Sincelight emitting devices have superior electrical and mechanicalcharacteristics, demands for light emitting devices have been increased.In connection to this, interests in white LEDs are increasing as analternative to fluorescent lamps and incandescent lamps.

In LED technology, solution for realization of white light is proposedvariously. Normally, realization of white LED technology is to put thephosphor on the light-emitting diode, and mix the primary emission fromthe light emitting diode and the secondary emission from the phosphor,which converts the wavelength. For example, as shown in WO 98/05078 andWO 98/12757, use a blue light emitting diode, which is capable ofemitting a peak wavelength at 450-490 nm, and YAG group material, whichabsorbs light from the blue light emitting diode and emits yellowishlight (mostly), which may have different wavelength from that of theabsorbed light

However, in such a usual white LED, color temperature range is narrowwhich is between about 6,000-8,000K, and CRI (Color Rendering Index) isabout 60 to 75. Therefore, it is hard to produce the white LED withcolor coordination and color temperature that are similar to those ofthe visible light. It is one of the reasons why only white light colorwith a cold feeling could be realized. Moreover, phosphors which areused for white LEDs are usually unstable in the water, vapor or polarsolvent, and this unstableness may cause changes in the emittingcharacteristics of white LED.

A light emitting device can be characterized as including a lightemitting diode configured to emit light and a phosphor configured tochange a wavelength of the light. The phosphor includes a compoundhaving a host material. Divalent copper ions and oxygen are componentsof the host material.

DESCRIPTION OF THE DRAWINGS

Further aspects of the invention may be apparent upon consideration ofthe following detailed description, taken in conjunction with theaccompanying drawings, in which like reference characters refer to likeparts throughout, and in which:

FIG. 1 shows a side cross-sectional view of an illustrative embodimentof a portion of a chip-type package light emitting device consistentwith this invention;

FIG. 2 shows a side cross-sectional view of an illustrative embodimentof a portion of a top-type package light emitting device consistent withthis invention;

FIG. 3 shows a side cross-sectional view of an illustrative embodimentof a portion of a lamp-type package light emitting device consistentwith this invention;

FIG. 4 shows a side cross-sectional view of an illustrative embodimentof a portion of a light emitting device for high power consistent withthis invention;

FIG. 5 shows a side cross-sectional view of another illustrativeembodiment of a portion of a light emitting device for high powerconsistent with this invention;

FIG. 6 shows emitting spectrum of a light emitting device withluminescent material consistent with this invention; and

FIG. 7 shows emitting spectrum of the light emitting device withluminescent material according to another embodiment of the invention.

DETAILED DESCRIPTION

Refer to the attached drawing, the wavelength conversion light emittingdevice is going to be explained in detail, and the light emitting deviceand the phosphor are separately is explained for easiness of explanationas below.

(Light Emitting Device)

FIG. 1 shows a side cross-sectional view of an illustrative embodimentof a portion of a chip-type package light emitting device consistentwith this invention. The chip-type package light emitting device maycomprise at least one light emitting diode and a phosphorescentsubstance. Electrodes 5 may be formed on both sides of substrate 1.Light emitting diode 6 emitting light may be mounted on one of theelectrodes 5. Light emitting diode 6 may be mounted on electrode 5through electrically conductive paste 9. An electrode of light emittingdiode 6 may be connected to electrode pattern 5 via an electricallyconductive wire 2.

Light emitting diodes may emit light with a wide range of wavelengths,for example, from ultraviolet light to visible light. In one embodimentconsistent with this invention, a UV light emitting diode and/or bluelight emitting diode may be use.

Phosphor, i.e., a phosphorescent substance, 3 may be placed on the topand side faces of the light emitting diode 6. The phosphor in consistentwith this invention may include lead and/or copper doped aluminate typecompounds, lead and/or copper doped silicates, lead and/or copper dopedantimonates, lead and/or copper doped germanates, lead and/or copperdoped germanate-silicates, lead and/or copper doped phosphates, or anycombination thereof. Phosphor 3 converts the wavelength of the lightfrom the light emitting diode 6 to another wavelength or otherwavelengths. In one embodiment consistent with this invention, the lightis in a visible light range after the conversion. Phosphor 3 may beapplied to light emitting diode 6 after mixing phosphor 3 with ahardening resin. The hardening resin including phosphor 3 may also beapplied to the bottom of light emitting diode 6 after mixing phosphor 3with electrically conductive paste 9.

The light emitting diode 6 mounted on substrate 1 may be sealed with oneor more sealing materials 10. Phosphor 3 may be placed on the top andside faces of light emitting is diode 6. Phosphor 3 can also bedistributed in the hardened sealing material during the production. Sucha manufacturing method is described in U.S. Pat. No. 6,482,664, which ishereby incorporated by reference in its entirety.

Phosphor 3 may comprise lead and/or copper doped chemical compound(s).Phosphor 3 may include one or more single chemical compounds. The singlecompound may have an emission peak of, for example, from about 440 nm toabout 500 nm, from about 500 nm to about 590 nm, or from about 580 nm to700 nm. Phosphor 3 may include one or more single phosphors, which mayhave an emission peak as exemplified above.

In regard to light emitting device 40, light emitting diode 6 may emitprimary light when light emitting diode 6 receives power from a powersupply. The primary light then may stimulate phosphor(s) 3, andphosphor(s) 3 may convert the primary light to a light with longerwavelength(s) (a secondary light). The primary light from the lightemitting diode 6 and the secondary light from the phosphors 3 arediffused and mixed together so that a predetermined color of light invisible spectrum may be emitted from light emitting diode 6. In oneembodiment consistent with this invention, more than one light emittingdiodes that have different emission peaks can be mounted together.Moreover, if the mixture ratio of phosphors is adjusted properly,specific color of light, color temperature, and CRI can be provided.

As described above, if the light emitting diode 6 and the compoundincluded in phosphor 3 are properly controlled then desired colortemperature or specific color coordination can be provided, especially,wide range of color temperature, for example, from about 2,000K to about8,000K or about 10,000K and/or color rendering index of greater thanabout 90. Therefore, the light emitting devices consistent with thisinvention may be used for electronic devices such as home appliances,stereos, telecommunication devices, and for interior/exterior is customdisplays. The light emitting devices consistent with this invention mayalso be used for automobiles and illumination products because theyprovide similar color temperatures and CRI to those of the visiblelight.

FIG. 2 shows a side cross-sectional view of an illustrative embodimentof a portion of a top-type package light emitting device consistent withthis invention. A top-type package light emitting device consistent withthis invention may have a similar structure as that of the chip typepackage light emitting device 40 of FIG. 1. The top-type package devicemay have reflector 31 which may reflect the light from the lightemitting diode 6 to the desire direction.

In top-type package light emitting device 50, more than one lightemitting diodes can be mounted. Each of such light emitting diodes mayhave a different peak wavelength from that of others. Phosphor 3 maycomprise a plurality of single compounds with different emission peak.The proportion of each of such plurality of compounds may be regulated.Such a phosphor may be applied to the light emitting diode and/oruniformly distributed in the hardening material of the reflector 31. Asexplained more fully below, the phosphor in consistent with thisinvention may include lead and/or copper doped aluminate type compounds,lead and/or copper doped silicates, lead and/or copper dopedantimonates, lead and/or copper doped germanates, lead and/or copperdoped germanate-silicates, lead and/or copper doped phosphates, or anycombination thereof.

In one embodiment consistent with this invention, the light emittingdevice of the FIG. or FIG. 2 can include a metal substrate, which mayhave good heat conductivity. Such a light emitting device may easilydissipate the heat from the light emitting diode. Therefore, lightemitting devices for high power may be manufactured. If a heat sink isprovided beneath the is metal substrate, the heat from the lightemitting diode may be dissipated more effectively.

FIG. 3 shows a side cross-sectional view of an illustrative embodimentof a portion of a lamp-type package light emitting device consistentwith this invention. Lamp type light emitting device 60 may have a pairof leads 51, 52, and a diode holder 53 may be formed at the end of onelead. Diode holder 53 may have a shape of cup, and one or more lightemitting diodes 6 may provided in the diode holder 53. When a number oflight emitting diodes are provided in the diode holder 53, each of themmay have a different peak wavelength from that of others. An electrodeof light emitting diode 6 may be connected to lead 52 by, for example,electrically conductive wire 2.

Regular volume of phosphor 3, which may be mixed in the epoxy resin, maybe provided in diode holder 53. As explained more fully below, phosphor3 may include lead and/or copper doped components.

Moreover, the diode holder may include the light emitting diode 6 andthe phosphor 3 may be sealed with hardening material such as epoxy resinor silicon resin.

In one embodiment consistent with this invention, the lamp type packagelight emitting device may have more than one pair of electrode pairleads.

FIG. 4 shows a side cross-sectional view of an illustrative embodimentof a portion of a light emitting device for high power consistent withthis invention. Heat sink 71 may be provided inside of housing 73 of thelight emitting device for high power 70, and it may be partially exposedto outside. A pair of lead frame 74 may protrude from housing 73.

One or more light emitting diodes may be mounted one lead frame 74, andan electrode of the light emitting diode 6 and another lead frame 74 maybe connected via electrically conductive wire. Electrically conductivepate 9 may be provided between light is emitting diode 6 and lead frame74. The phosphor 3 may be placed on top and side faces of light emittingdiode 6.

FIG. 5 shows a side cross-sectional view of another illustrativeembodiment of a portion of a light emitting device for high powerconsistent with this invention.

Light emitting device for high power 80 may have housing 63, which maycontain light emitting diodes 6, 7, phosphor 3 arranged on the top andside faces of light emitting diodes 6, 7, one or more heat sinks 61, 62,and one or more lead frames 64. The lead frames 64 may receive powerfrom a power supplier and may protrude from housing 63.

In the light emitting devices for high power 70, 80 in the FIGS. 4 and5, the phosphor 3 can be added to the paste, which may be providedbetween heat sink and light emitting devices. A lens may be combinedwith housing 63, 73.

In a light emitting device for high power consistent with thisinvention, one or more light emitting diodes can be used selectively andthe phosphor can be regulated depending on the light emitting diode. Asexplained more fully below, the phosphor may include lead and/or copperdoped components.

A light emitting device for high power consistent with this inventionmay have a radiator (not shown) and/or heat sink(s). Air or a fan may beused to cool the radiator.

The light emitting devices consistent with this invention is not limitedto the structures described above, and the structures can be modifieddepending on the characteristics of light emitting diodes, phosphor,wavelength of light, and also applications. Moreover, new part can beadded to the structures.

An exemplary phosphor consistent with this invention is as follows.

(Phosphor)

Phosphor in consistence with this invention may include lead and/orcopper doped chemical compounds. The phosphor may be excited by UVand/or visible light, for example, blue light. The compound may includeAluminate, Silicate, Antimonate, Germanate, Germanate-silicate, orPhosphate type compounds.

Aluminate type compounds may comprise compounds having formula (1), (2),and/or (5)

a(M′O).b(M″₂O).c(M″X).dAl₂O₃e(M′″O).f(M″″₂O₃).g(M′″″_(o)O_(p))h(M″″″_(x)O_(y))  (1)

wherein M′ may be Pb, Cu, and/or any combination thereof; M″ may be oneor more monovalent elements, for example, Li, Na, K, Rb, Cs, Au, Ag,and/or any combination thereof; M′″ may be one or more divalentelements, for example, Be, Mg, Ca, Sr, Ba, Zn, Cd, Mn, and/or anycombination thereof; M″″ may be one or more trivalent elements, forexample, Sc, B, Ga, In, and/or any combination thereof; M′″″ may be Si,Ge, Ti, Zr, Mn, V, Nb, Ta, W, Mo, and/or any combination thereof; M″″″may be Bi, Sn, Sb, Sc, Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho,Er, Tm, Yb, Lu, and/or any combination thereof; X may be F, Cl, Br, J,and/or any combination thereof; 0<a≦2; 0≦b≦2; 0≦c≦2; 0≦d≦8; 0<e≦4;0≦f≦3; 0≦g≦8; 0<h≦2; 1≦o≦2; 1≦p≦5; 1≦x≦2; and 1≦y≦5.

a(M′O).b(M″₂O).c(M″X)4-a-b-c(M′″O).7(Al₂O₃).d(B₂O₃).e(Ga₂O₃).f(SiO₂).g(GeO₂).h(M″″_(x)O_(y))  (2)

wherein M′ may be Pb, Cu, and/or any combination thereof; M″ may be oneor more monovalent elements, for example, Li, Na, K, Rb, Cs, Au, Ag,and/or any combination thereof; M′″ may be one or more divalentelements, for example, Be, Mg, Ca, Sr, Ba, Zn, Cd, Mn, and/or anycombination thereof; M″″ may be Bi, Sn, Sb, Sc, Y, La, In, Ce, Pr, Nd,Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, and any combination thereof;X may be F, Cl, Br, J, and any combination thereof; 0<a≦4; 0≦b≦2; 0≦c≦2;0≦d≦1; 0≦e≦1; 0≦f≦1; 0≦g≦1; 0<h≦2; 1≦x≦2; and 1≦y≦5.

The preparation of copper as well as lead doped luminescent materialsmay be a basic solid state reaction. Pure starting materials without anyimpurities, e.g. iron, may be used. Any starting material which maytransfer into oxides via a heating process may be used to form oxygendominated phosphors.

Examples of Preparation:

Preparation of the luminescent material having formula (3)

Cu_(0.02)Sr_(3.98)Al₁₄O₂₅:Eu  (3)

Starting materials: CuO, SrCO₃, Al(OH)₃, Eu₂O₃, and/or any combinationthereof.

The starting materials in the form of oxides, hydroxides, and/orcarbonates may be mixed in stoichiometric proportions together withsmall amounts of flux, e.g., H₃BO₃. The mixture may be fired in analumina crucible in a first step at about 1,200° C. for about one hour.After milling the pre-fired materials a second firing step at about1,450° C. in a reduced atmosphere for about 4 hours may be followed.After that the material may be milled, washed, dried and sieved. Theresulting luminescent material may have an emission maximum of about 494nm.

TABLE 1 copper doped Eu²⁺-activated aluminate compared withEu²⁺-activated aluminate without copper at about 400 nm excitationwavelength. Compound Copper doped compound without copperCu_(0.02)Sr_(3.98)Al₁₄O₂₅:Eu Sr₄Al₁₄O₂₅:Eu Luminous density (%) 103.1100 Wavelength (nm) 494 493

Preparation of the luminescent material having formula (4)

Pb_(0.5)Sr_(3.95)Al₁₄O₂₅:Eu  (4)

Starting materials: PbO, SrCO.sub.3, Al.sub.2O.sub.3, Eu.sub.2O.sub.3,and/or any combination thereof.

The starting materials in form of very pure oxides, carbonates, or othercomponents which may decompose thermically into oxides, may be mixed instoichiometric proportion together with small amounts of flux, forexample, H₃BO₃. The mixture may be fired in an alumina crucible at about1,200° C. for about one hour in the air. After milling the pre-firedmaterials a second firing step at about 1,450° C. in air for about 2hours and in a reduced atmosphere for about 2 hours may be followed.Then the material may be milled, washed, dried, and sieved. Theresulting luminescent material may have an emission maximum of fromabout 494.5 nm.

TABLE 2 lead doped Eu²⁺-activated aluminate compared with Eu²⁺-activatedaluminate without lead at about 400 nm excitation wavelength Lead dopedcompound Compound without lead Pb_(0.05)Sr_(3.95)Al₁₄O₂₅:EuSr₄Al₁₄O₂₅:Eu Luminous density (%) 101.4 100 Wavelength (nm) 494.5 493

TABLE 3 optical properties of some copper and/or lead doped aluminatesexcitable by long wave ultraviolet and/or by visible light and theirluminous density in % at 400 nm excitation wavelength. Luminous densityat 400 nm Peak wave Peak wave excitation length of length of Possiblecompared with lead/copper materials excitation copper/lead not dopedwithout range doped materials lead/copper Composition (nm) compounds (%)(nm) (nm) Cu_(0.5)Sr_(3.5)Al₁₄O₂₅:Eu 360-430 101.2 495 493Cu_(0.02)Sr_(3.98)Al₁₄O₂₅:Eu 360-430 101.4 494.5 493Pb_(0.05)Sr_(3.95)Al₁₄O₂₅:Eu 360-430 103. 494.5 493Cu_(0.01)Sr_(3.99)Al_(13.995)Si_(0.005)O₂₅:Eu 360-430 103 494 492Cu_(0.01)Sr_(3.395)Ba_(0.595)Al₁₄O₂₅:Eu, Dy 360-430 100.8 494 493Pb_(0.05)Sr_(3.95)Al_(13.95)Ga_(0.05)O₂₅:Eu 360-430 101.5 494 494

a(M′O).b(M″O).c(Al₂O₃).d(M′″₂O₃).e(M″″O₂).f(M′″″-_(x)O_(y))  (5)

wherein M′ may be Pb, Cu, and/or any combination thereof; M″ may be Be,Mg, Ca, Sr, Ba, Zn, Cd, Mn, and/or any combination thereof; M′″ may beB, Ga, In, and/or any combination thereof; M″″ may be Si, Ge, Ti, Zr,Hf, and/or any combination thereof; M′″″ may is be Bi, Sn, Sb, Sc, Y,La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, and/or anycombination thereof; 0<a≦1; 0≦b≦2; 0<c≦8; 0≦d≦1; 0≦e≦1; 0<f≦2; 1≦x≦2;and 1≦y≦5.

Example of Preparation:

Preparation of the luminescent material having formula (6)

Cu_(0.05)Sr_(0.95)Al_(1.9997)Si_(0.0003)O₄:Eu  (6)

Starting materials: CuO, SrCO₃, Al₂O₃, SiO₃, Eu₂O₃, and/or anycombination thereof.

The starting materials in the form of, for example, pure oxides and/oras carbonates may be mixed in stoichiometric proportions together withsmall amounts of flux, for example, AlF₃. The mixture may be fired in analumina crucible at about 1,250° C. in a reduced atmosphere for about 3hours. After that the material may be milled, washed, dried and sieved.The resulting luminescent material may have an emission maximum of about521.5 nm.

TABLE 4 copper doped Eu²⁺-activated aluminate compared withEu²⁺-activated aluminate without copper at about 400 nm excitationwavelength. Compound Copper doped compound without copperCu_(0.05)Sr_(0.95)Al_(1.9997)Si_(0.0003)O₄:Eu SrAl₂O₄:Eu Luminousdensity (%) 106 100 Wavelength (nm) 521.5 519

Preparation of the luminescent material having formula (7)

Cu_(0.12)BaMg_(1.88)Al₁₆O₂₇:Eu  (7)

Starting materials: CuO, MgO, BaCO₃, Al(OH)₃, Eu₂O₃, and/or anycombination thereof.

The starting materials in the form of, for example, pure oxides,hydroxides, and/or carbonates may be mixed in stoichiometric proportionstogether with small amounts of flux, for example, AlF₃. The mixture maybe fired in an alumina crucible at about 1,420° C. in a reducedatmosphere for about 2 hours. After that the material may be milled,washed, dried, and sieved. The resulting luminescent material may havean emission maximum of about 452 nm.

TABLE 5 copper doped Eu²⁺-activated aluminate compared with copper notdoped Eu²⁺-activated aluminate at 400 nm excitation wavelength. CompoundCopper doped compound without copper Cu_(0.12)BaMg_(1.88)Al₁₆O₂₇:EuBaMg₂Al₁₆O₂₇:Eu Luminous density (%) 101 100 Wavelength (nm) 452 450

Preparation of the luminescent material having formula (8) (8)

Pb_(0.1)Sr_(0.9)Al₂O₄:Eu  (8)

Starting materials: PbO, SrCO₃, Al(OH)₃, Eu₂O₃, and/or any combinationthereof.

The starting materials in form of, for example, pure oxides, hydroxides,and/or carbonates may be mixed in stoichiometric proportions togetherwith small amounts of flux, for example, H₃BO₃. The mixture may be firedin an alumina crucible at about 1,000° C. for about 2 hours in the air.After milling the pre-fired materials a second firing step at about1,420° C. in the air for about 1 hour and in a reduced atmosphere forabout 2 hours may be followed. After that the material may be milled,washed, dried and sieved. The resulting luminescent material may have anemission maximum of about 521 nm.

TABLE 6 lead doped Eu²⁺-activated aluminate compared with Eu²⁺-activatedaluminate without lead at about 400 nm excitation wavelength. Lead dopedcompound Compound without lead Pb_(0.1)Sr_(0.9)Al₂O₄:Eu SrAl₂O₄:EuLuminous density (%) 102 100 Wavelength (nm) 521 519

Results obtained in regard to copper and/or lead doped aluminates areshown in table 7.

TABLE 7 optical properties of some copper and/or lead doped aluminatesexcitable by long wave ultraviolet and/or by visible light and theirluminous density in % at 400 nm excitation wavelength. Luminous densityat 400 nm Peak wave Peak wave excitation length of length of Possiblecompared with lead/copper materials excitation copper/lead not dopedwithout range doped materials lead/copper Composition (nm) compounds (%)(nm) (nm) Cu_(0.05)Sr_(0.95)Al_(1.9997)Si_(0.0003)O₄:Eu 360-440 106  521.5 519 Cu_(0.2)Mg_(0.7995)Li_(0.0005)Al_(1.9)Ga_(0.1)O₄:Eu, Dy360-440 101.2 482 480 Pb_(0.1)Sr_(0.09)Al₂O₄:Eu 360-440 102 521 519Cu_(0.05)BaMg_(1.95)Al₁₆O₂₇:Eu, Mn 360-400 100.5 451, 515 450, 515Cu_(0.12)BaMg_(1.88)Al₁₆O₂₇:Eu 360-400 101 452 449Cu_(0.01)BaMg_(0.99)Al₁₀O₁₇:Eu 360-400 102.5 451 449Cu_(0.01)BaMg_(0.9)Al_(9.5)Ga_(0.5)O₁₇:Eu, Dy 360-400 100.8 448 450Pb_(0.08)Sr_(0.902)Al₂O₄:Eu, Dy 360-440 102.4 521 519Pb_(0.2)Sr_(0.8)Al₂O₄:Mn 360-440 100.8 658 655Cu_(0.06)Sr_(0.94)Al₂O₄:Eu 360-440 102.3 521 519Cu_(0.05)Ba_(0.94)Pb_(0.06)Mg_(0.95)Al₁₀O₁₇:Eu 360-440 100.4 451 449Pb_(0.3)Ba_(0.7)Cu_(0.1)Mg_(1.9)Al₁₆O₂₇:Eu 360-400 100.8 452 450Pb_(0.3)Ba_(0.7)Cu_(0.1)Mg_(1.9)Al₁₆O₂₇:Eu, Mn 360-400 100.4 452, 515450, 515

A lead and/or copper doped silicates having formula (9)

a(M′O).b(M″O).c(M′″X).d(M′″₂O).e(M″″₂O₃).f(M′″″_(o)O_(p)).g(SiO₂).h(M″″″_(x)O_(y))  (9)

wherein M′ may be Pb, Cu, and/or any combination thereof; M″ may be Be,Mg, Ca, Sr, Ba, Zn, Cd, Mn, and/or any combination thereof; M′″ may beLi, Na, K, Rb, Cs, Au, Ag, and/or any combination thereof; M″″ may beAl, Ga, In, and/or any combination thereof; M′″″ may be Ge, V, Nb, Ta,W, Mo, Ti, Zr, Hf, and/or any combination thereof; M″″″ may be Bi, Sn,Sb, Sc, Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu,and/or any combination thereof; X may be F, Cl, Br, J, and anycombination thereof; 0<a≦2; 0<b≦8; 0≦c≦4; 0≦d≦2; 0≦e≦2; 0≦f≦2; 0≦g≦10;0<h≦5; 1≦o≦2; 1≦p≦5; 1≦x≦2; and 1≦y≦5.

Example of Preparation:

Preparation of the luminescent material having formula (10)

Cu_(0.05)Sr_(1.7)Ca_(0.25)SiO₄:Eu  (10)

Starting materials: CuO, SrCO₃, CaCO₃, SiO₂, Eu₂O₃, and/or anycombination thereof.

The starting materials in the form of pure oxides and/or carbonates maybe mixed in stoichiometric proportions together with small amounts offlux, for example, NH₄Cl. The mixture may be fired in an aluminacrucible at about 1,200° C. in an inert gas atmosphere (e.g., N₂ ornoble gas) for about 2 hours. Then the material may be milled. Afterthat, the material may be fired in an alumina crucible at about 1,200°C. in a slightly reduced atmosphere for about 2 hours. Then, thematerial may be milled, washed, dried, and sieved. The resultingluminescent material may have an emission maximum at about 592 nm.

TABLE 8 copper doped Eu²⁺-activated silicate compared withEu²⁺-activated silicate without copper at about 400 nm excitationwavelength. Copper doped compound Compound without copperCu_(0.05)Sr_(1.7)Ca_(0.25)SiO₄:Eu Si_(1.7)Ca_(0.3)SiO₄:Eu Luminous 104100 density (%) Wavelength (nm) 592 588

Preparation of the Luminescent Material Having Formula (11):

Cu_(0.2)Ba₂Zn_(0.2)Mg_(0.6)Si₂O₇:Eu  (11)

Starting materials: CuO, BaCO₃, ZnO, MgO, SiO₂, Eu₂O₃, and/or anycombination thereof.

The starting materials in the form of very pure oxides and carbonatesmay be mixed in stoichiometric proportions together with small amountsof flux, for example, NH₄Cl. In a first step the mixture may be fired inan alumina crucible at about 1,100° C. in a reduced atmosphere for about2 hours. Then the material may be milled. After that the material may befired in an alumina crucible at about 1,235° C. in a reduced atmospherefor about 2 hours. Then that the material may be milled, washed, driedand sieved. The resulting luminescent material may have an emissionmaximum at about 467 nm.

TABLE 9 copper doped Eu²⁺-activated silicate compared withEu²⁺-activated silicate without copper at 400 nm excitation wavelength.Compound Copper doped compound without copperCu_(0.2)Sr₂Zn_(0.2)Mg_(0.6)Si₂O₇:Eu Sr₂Zn₂Mg_(0.6)Si₂O₇:Eu Luminous101.5 100 density (%) Wavelength (nm) 467 465

Preparation of the luminescent material having formula (12)

Pb_(0.1)Ba_(0.95)Sr_(0.95)Si_(0.998)Ge_(0.002)O₄:Eu  (12)

Starting materials: PbO, SrCO₃, BaCO₃, SiO₂, GeO₂, Eu₂O₃, and/or anycombination thereof.

The starting materials in the form of oxides and/or carbonates may bemixed in stoichiometric proportions together with small amounts of flux,for example, NH₄Cl. The mixture may be fired in an alumina crucible atabout 1,000° C. for about 2 hours in the air. After milling thepre-fired materials a second firing step at 1,220° C. in air for 4 hoursand in reducing atmosphere for 2 hours may be followed. After that thematerial may be milled, washed, dried and sieved. The resultingluminescent material may have an emission maximum at about 527 nm.

TABLE 10 lead doped Eu²⁺-activated silicate compared with Eu²⁺-activatedsilicate without lead at about 400 nm excitation wavelength. CompoundLead doped compound without leadPb_(0.1)Ba_(0.95)Sr_(0.95)Si_(0.998)Ge_(0.002)O₄:Eu BaSrSiO₄:Eu Luminous101.3 100 density (%) Wavelength (nm) 527 525

Preparation of the luminescent material having formula (13)

Pb_(0.25)Sr_(3.75)Si₃O₈Cl₄:Eu  (13)

Starting materials: PbO, SrCO₃, SrCl₂, SiO₂, Eu₂O₃, and any combinationthereof.

The starting materials in the form of oxides, chlorides, and/orcarbonates may be mixed in stoichiometric proportions together withsmall amounts of flux, for example, NH₄Cl. The mixture may be fired inan alumina crucible in a first step at about 1,100° C. for about 2 hoursin the air. After milling the pre-fired materials a second firing stepat about 1,220° C. in the air for about 4 hours and in a reducedatmosphere for about 1 hour may be followed. After that the material maybe milled, washed, dried and sieved. The resulting luminescent materialmay have an emission maximum at about 492 nm.

TABLE 11 lead doped Eu²⁺-activated chlorosilicate compared withEu²⁺-activated chlorosilicate without lead at 400 nm excitationwavelength. Lead doped compound Compound without leadPb_(0.25)Sr_(3.75)Si₃O₈Cl₄:Eu Sr₄Si₃O₈Cl₄:Eu Luminous 100.6 100 density(%) Wavelength (nm) 492 490

Results obtained with respect to copper and/or lead doped silicates areshown in table 12.

TABLE 12 optical properties of some copper and/or lead doped rare earthactivated silicates excitable by long wave ultraviolet and/or by visiblelight and their luminous density in % at about 400 nm excitationwavelength. Luminous density at 400 nm Peak wave Peak wave excitationlength of length of Possible compared with lead/copper materialsexcitation copper/lead not doped without range doped materialslead/copper Composition (nm) compounds (%) (nm) (nm)Pb_(0.1)Ba_(0.95)Sr_(0.95)Si_(0.998)Ge_(0.002)O₄:Eu 360-470 101.3 527525 Cu_(0.02)(Ba,Sr,Ca,Zn)_(1.98)SiO₄:Eu 360-500 108.2 565 560Cu_(0.05)Sr_(1.7)Ca_(0.25)SiO₄:Eu 360-470 104 592 588Cu_(0.05)Li_(0.002)Sr_(1.5)Ba_(0.448)SiO₄:Gd, Eu 360-470 102.5 557 555Cu_(0.2)Sr₁Zu_(0.2)Mg_(0.5)Si₁O₇:Eu 360-450 101.5 467 465Cu_(0.02)Ba_(2.8)Sr_(0.2)Mg_(0.98)Si₂O₈:Eu, Mn 360-420 100.8 440, 660438, 660 Pb_(0.25)Sr_(3.75)Si₃O₈Cl₄:Eu 360-470 100.6 492 490Cu_(0.2)Ba_(2.2)Sr_(0.75)Pb_(0.05)Zn_(0.8)Si₂O₈:Eu 360-430 100.8 448 445Cu_(0.2)Ba₃Mg_(0.8)Si_(1.99)Ge_(0.01)O₈:Eu 360-430 101 444 440Cu_(0.5)Zn_(0.5)Ba₂Ge_(0.2)Si_(1.8)O₇:Eu 360-420 102.5 435 433Cu_(0.8)Mg_(0.2)Ba₃Si₂O₈:Eu, Mn 360-430 103 438, 670 435, 670Pb_(0.15)Ba_(1.84)Zn_(0.01)Si_(0.99)Zr_(0.01)O₄:Eu 360-500 101 512 510Cu_(0.2)Ba₅Ca_(2.8)Si₄O₁₆:Eu 360-470 101.8 495 491

With lead and/or copper doped antimonates having formula (14)

a(M′O).b(M″₂O).c(M″X).d(Sb₂O₅).e(M′″O).f(M″″_(x)O_(y))  (14)

wherein M′ may be Pb, Cu, and/or any combination thereof; M″ may be Li,Na, K, Rb, Cs, Au, Ag, and/or any combination thereof; M′″ may be Be,Mg, Ca, Sr, Ba, Zn, Cd, Mn, and/or any combination thereof; M″″ may beBi, Sn, Sc, Y, La, Pr, Sm, Eu, Tb, Dy, Gd, and/or any combinationthereof; X may be F, Cl, Br, J, and/or any combination thereof; 0<a≦2;0≦b≦2; 0≦c≦4; 0<d≦8; 0≦e≦8; 0≦f≦2; 1≦x≦2; and 1≦y≦5.

Examples of Preparation:

Preparation of the luminescent material having formula (15)

Cu_(0.2)Mg_(1.7)Li_(0.2)Sb₂O₇:Mn  (15)

Starting materials: CuO, MgO, Li₂O, Sb₂O₅, MnCO₃, and/or any combinationis thereof.

The starting materials in the form of oxides may be mixed instoichiometric proportion together with small amounts of flux. In afirst step the mixture may be fired in an alumina crucible at about 985°C. in the air for about 2 hours. After pre-firing the material may bemilled again. In a second step the mixture may be fired in an aluminacrucible at about 1,200° C. in an atmosphere containing oxygen for about8 hours. After that the material may be milled, washed, dried andsieved. The resulting luminescent material may have an emission maximumat about 626 nm.

TABLE 13 copper doped antimonate compared with antimonate without copperat about 400 nm excitation wavelength. Comparison Copper doped compoundwithout copper Cu_(0.2)Mg_(1.7)Li_(0.2)Sb₂O₇:Mn Mg₂Li_(0.2)Sb₂O₇:MnLuminous density (%) 101.8 100 Wavelength (nm) 652 650

Preparation of the luminescent material having formula (16)

Pb_(0.006)Ca_(0.6)Sr_(0.394)Sb₂O₆  (16)

Starting materials: PbO, CaCO₃, SrCO₃, Sb₂O₅, and/or any combinationthereof.

The starting materials in the form of oxides and/or carbonates may bemixed in stoichiometric proportions together with small amounts of flux.In a first step the mixture may be fired in an alumina crucible at about975° C. in the air for about 2 hours. After pre-firing the material maybe milled again. In a second step the mixture may be fired in an aluminacrucible at about 1,175° C. in the air for about 4 hours and then in anoxygen-containing atmosphere for about 4 hours. After that the materialmay be milled, washed, dried and sieved. The resulting luminescentmaterial may have an emission maximum at about 637 nm.

TABLE 14 lead doped antimonate compared with antimonate without lead at400 nm excitation wavelength. Lead doped compound Compound without leadPb_(0.006)Ca_(0.6)Sr_(0.394)Sb₀O₆ Ca_(0.6)Sr_(0.4)Sb₂O₆ Luminous 102 100density (%) Wavelength (nm) 637 638

Results obtained in respect to copper and/or lead doped antimonates areshown in table 15.

TABLE 15 optical properties of some copper and/or lead doped antimonatesexcitable by long wave ultraviolet and/or by visible light and theirluminous density in % at about 400 nm excitation wavelength. Luminousdensity at 400 nm Peak wave Peak wave excitation length of length ofPossible compared with lead/copper materials excitation copper/lead notdope without range doped compounds materials lead/copper Composition(nm) (%) (nm) (nm) Pb_(0.2)Mg_(0.002)Ca_(1.798)Sb₂O₆F₂:Mn 360-400 102645 649 Cu_(0.15)Ca_(1.845)Sr_(0.005)Sb_(1.998)Si_(0.002)O₇:Mn 360-400101.5 660 658 Cu_(0.2)Mg_(1.7)Li_(0.2)Sb₂O₇:Mn 360-400 101.8 652 650Cu_(0.2)Pb_(0.01)Ca_(0.79)Sb_(1.98)Nb_(0.02)O₆:Mn 360-400 98.5 658 658Cu_(0.01)Ca_(1.99)Sb_(1.9995)V_(0.0005)O₇:Mn 360-400 100.5 660 657Pb_(0.006)Ca_(0.6)Sr_(0.394)Sb₂O₆ 360-400 102 637 638Cu_(0.02)Ca_(0.9)Sr_(0.5)Ba_(0.4)Mg_(0.18)Sb₂O₇ 360-400 102.5 649 645Pb_(0.198)Mg_(0.004)Ca_(1.798)Sb₂O₆F₂ 360-400 101.8 628 630

Lead and/or copper doped germanates and/or a germanate-silicates havingformula (17)

a(M′O).b(M″₂O).c(M″X).dGeO₂.e(M′″O).f(M″″₂O₃).g(M′″″_(o)O_(p)).h(M″″″_(x)O_(y))  (17)

wherein M′ may be Pb, Cu, and/or any combination thereof; M″ may be Li,Na, K, Rb, Cs, Au, Ag, and/or any combination thereof; M′″ may be Be,Mg, Ca, Sr, Ba, Zn, Cd, and/or any combination thereof; M″″ may be Sc,Y, B, Al, La, Ga, In, and/or any combination thereof; M′″″ may be Si,Ti, Zr, Mn, V, Nb, Ta, W, Mo, and/or any combination thereof; M″″″ maybe Bi, Sn, Pr, Sm, Eu, Gd, Dy, and/or any combination thereof; X may beF, Cl, Br, J, and/or any combination thereof; 0<a≦2; 0≦b≦2; 0≦c≦10;0<d≦10; 0≦e≦14; 0≦f≦14; 0≦g≦10; 0≦h≦2; 1≦o≦2; 1≦p≦5; 1≦x≦2; and 1≦y≦5.

Example of Preparation:

Preparation of the luminescent material having formula (18)

Pb_(0.004)Ca_(1.99)Zn_(0.006)Ge_(0.8)Si_(0.2)O₄:Mn  (18)

Starting materials: PbO, CaCO₃, ZnO, GeO₂, SiO₂, MnCO₃, and/or anycombination thereof,

The starting materials in the form of oxides and/or carbonates may bemixed in stoichiometric proportions together with small amounts of flux,for example, NH₄Cl. In a first step the mixture may be fired in analumina crucible at about 1,200° C. in an oxygen-containing atmospherefor about 2 hours. Then, the material may be milled again. In a secondstep the mixture may be fired in an alumina crucible at about 1,200° C.in oxygen containing atmosphere for about 2 hours. After that thematerial may be milled, washed, dried and sieved. The resultingluminescent material may have an emission maximum at about 655 nm.

TABLE 16 lead doped Mn-activated germanate compared with Mn-activatedgermanate without lead at about 400 nm excitation wavelength Copperdoped compound Comparison without copperPb_(0.004)Ca_(1.99)Zn_(0.006)Ge_(0.8)Si_(0.2)O₄:MnCa_(1.99)Zn_(0.01)Ge_(0.8)Si_(0.2)O₄:Mn Luminous density (%) 101.5 100Wavelength (nm) 655 657

Preparation of the luminescent material having formula (19)

Cu_(0.46)Sr_(0.54)Ge_(0.6)Si_(0.4)O₃:Mn  (19)

Starting materials: CuO, SrCO₃, GeO₂, SiO₂, MnCO₃, and/or anycombination thereof.

The starting materials in the form of oxides and/or carbonates may bemixed in stoichiometric proportions together with small amounts of flux,for example, NH₄Cl. In a first step the mixture may be fired in analumina crucible at about 1,100° C. in an oxygen-containing atmospherefor about 2 hours. Then, the material may be milled again. In a secondstep the mixture may be fired in an alumina crucible at about 1,180° C.in an oxygen-containing atmosphere for about 4 hours. After that thematerial may be milled, washed, dried and sieved. The resultingluminescent material may have an emission maximum at about 658 nm.

TABLE 17 copper doped Mn-activated germanate-silicate compared with Mn-activated germanate-silicate without copper at 400 nm excitationwavelength Compound Copper doped compound without copperCu_(0.46)Sr_(0.54)Ge_(0.6)Si_(0.4)O₃:Mn SrGe_(0.6)Si_(0.4)O₃:Mn Luminous103 100 density (%) Wavelength (nm) 658 655

TABLE 18 optical properties of some copper and/or lead dopedgermanate-silicates excitable by long wave ultraviolet and/or by visiblelight and their luminous density in % at about 400 nm excitationwavelength Luminous density at 400 nm Peak wave Peak wave excitationlength of length of Possible compared with lead/copper materialsexcitation copper/lead not doped without range doped materialslead/copper Composition (nm) compounds (%) (nm) (nm)Pb_(0.004)Ca_(1.99)Zn_(0.006)Ge_(0.8)Si_(0.2)O₄:Mn 360-400 101.5 655 657Pb_(0.002)Sr_(0.954)Ca_(1.044)Ge_(0.93)Si_(0.07)O₄:Mn 360-400 101.5 660661 Cu_(0.46)Sr_(0.54)Ge_(0.6)Si_(0.4)O₃:Mn 360-400 103 658 655Cu_(0.002)Sr_(0.998)Ba_(0.99)Ca_(0.01)Si_(0.98)Ge_(0.02)O₄:Eu 360-470102 538 533 Cu_(1.45)Mg_(26.55)Ge_(9.4)Si_(0.6)O₄₈:Mn 360-400 102 660657 Cu_(1.2)Mg_(26.8)Ge_(8.9)Si_(1.1)O₄₈:Mn 360-400 103.8 670 656Cu₄Mg₂₀Zn₄Ge₅Si_(2.5)O₃₈F₁₀:Mn 360-400 101.5 658 655Pb_(0.001)Ba_(0.849)Zn_(0.05)Sr_(1.1)Ge_(0.04)Si_(0.96)O₄:Eu 360-470101.8 550 545 Cu_(0.05)Mg_(4.95)GeO₆F₂:Mn 360-400 100.5 655 653Cu_(0.05)Mg_(3.95)GeO_(5.5)F:Mn 360-400 100.8 657 653

Lead and/or copper doped phosphates having formula (20)

a(M′O).b(M″₂O).c(M″X).dP₂O₅.e(M′″O).f(M″″₂O₃).g(M′″″O₂).h(M″″″_(x)O_(y))  (20)

wherein M′ may be Pb, Cu, and/or any combination thereof; M″ may be Li,Na, K, Rb, Cs, Au, Ag, and/or any combination thereof; M′″ may be Be,Mg, Ca, Sr, Ba, Zn, Cd, Mn, and/or any combination thereof; M″″ may beSc, Y, B, Al, La, Ga, In, and/or any combination thereof; M′″″ may beSi, Ge, Ti, Zr, Hf, V, Nb, Ta, W, Mo, and/or any combination thereof;M″″″ may be Bi, Sn, Pr, Sm, Eu, Gd, Dy, Ce, Tb, and/or any combinationthereof; X may be F, Cl, Br, J, and/or any combination thereof; 0<a≦2;0≦b≦12; 0≦c≦16; 0<d≦3; 0≦e≦5; 0≦f≦3; 0≦g≦2; 0<h≦2; 1≦x≦2; and 1≦y≦5.

Examples of Preparation:

Preparation of the luminescent material having formula (21)

Cu_(0.02)Ca_(4.98)(PO₄)₃Cl:Eu  (21)

Starting materials: CuO, CaCO₃, Ca₃(PO₄)₂, CaCl₂, Eu₂O₃, and/or anycombination thereof.

The starting materials in the form of oxides, phosphates, and/orcarbonates and chlorides may be mixed in stoichiometric proportionstogether with small amounts of flux. The mixture may be fired in analumina crucible at about 1,240° C. in reducing atmosphere for about 2hours. After that the material may be milled, washed, dried and sieved.The luminescent material may have an emission maximum at about 450 nm.

TABLE 19 copper doped Eu²⁺-activated chlorophosphate compared with Eu²⁺-activated chlorophosphate without copper at about 400 nm excitationwavelength. Copper doped compound Compound without copperCu_(0.02)Ca_(4.98) (PO₄)₃Cl:Eu Ca₅(PO₄)₃Cl:Eu Luminous 101.5 100 density(%) Wavelength (nm) 450 447

TABLE 20 copper and/or lead doped phosphates excitable by long waveultraviolet and/or by visible light and their luminous density in % atabout 400 nm excitation wavelength Luminous density at 400 nm Peak wavePeak wave excitation length of length of Possible compared withlead/copper materials excitation copper/lead not doped without rangedoped materials lead/copper Composition (nm) compounds (%) (nm) (nm)Cu_(0.02)Sr_(4.98)(PO₄)₃Cl:Eu 360-410 101.5 450 447Cu_(0.2)Mg_(0.8)BaP₂O₇:Eu 360-400 102 638 635Pb_(0.5)Sr_(1.5)P_(1.84)B_(0.16)O_(6.84):Eu 360-400 102 425 420Cu_(0.5)Mg_(0.5)Ba₂(P,Si)₂O₈:Eu 360-400 101 573 570Cu_(0.5)Sr_(9.5)(P,B)₆O₂₄Cl₂:Eu 360-410 102 460 456Cu_(0.5)Ba₃Sr_(6.5)P₆O₂₄(F,Cl)₂:Eu 360-410 102 443 442Cu_(0.05)(Ca,Sr,Ba)_(4.95)P₃O₁₂Cl:Eu, Mn 360-410 101.5 438, 641 435, 640Pb_(0.1)Ba_(2.9)P₂O₈:Eu 360-400 103 421 419

Meanwhile, the phosphor of the light emitting device consistent withthis invention can comprise aluminate, silicate, antimonate, germanate,phosphate type chemical compound, and any combination thereof.

FIG. 6 is a one of the embodiment's emission spectrum according to theinvention, which the phosphor is used for the light emitting device. Theembodiment may have a light emitting diode with 405 nm wavelength andthe phosphor, which is mixture of the selected multiple chemicalcompounds in proper ratio. The phosphor may be composed ofCu_(0.05)BaMg_(1.95)Al₁₆O₂₇:Eu which may have peak wavelength at about451 nm, Cu_(0.03)Sr_(1.5)Ca_(0.47)SiO₄:Eu which may have peak wavelengthat 586 nm, Pb_(0.006)Ca_(0.6)Sr_(0.394)Sb₂O₆:Mn⁴⁺ which may have peakwavelength at about 637 nm,Pb_(0.15)Ba_(1.84)Zn_(0.01)Si_(0.99)Zr_(0.01)O₄:Eu is which may havepeak wavelength at around 512 nm, and Cu_(0.2)Sr_(3.8)Al₁₄O₂₅:Eu whichmay have peak wavelength at about 494 nm.

In such an embodiment, part of the initial about 405 nm wavelengthemission light from the light emitting diode is absorbed by thephosphor, and it is converted to longer 2^(nd) wavelength. The 1^(st)and 2^(nd) light are mixed together and the desire emission is produced.As the shown FIG. 6, the light emitting device convert the 1^(st) UVlight of 405 nm wavelength to wide spectral range of visible light, thatis, white light, and at this time the color temperature is about 3,000Kand CRI is about 90 to about 95.

FIG. 7 is another embodiment's emission spectrum according to theinvention, which the phosphor is applied for the light emitting device.The embodiment may have a light emitting diode with about 455 nmwavelength and the phosphor, which is mixture of the selected multiplechemical compounds in proper ratio.

The phosphor is composed of Cu_(0.05)Sr_(1.7)Ca_(0.25)SiO₄:Eu which mayhave peak wavelength at about 592 nm,Pb_(0.1)Ba_(0.95)Sr_(0.95)Si_(0.998)Ge_(0.002)O₄:Eu which may have peakwavelength at about 527 nm, andCu_(0.05)Li_(0.002)Sr_(1.5)Ba_(0.448)SiO₄:Gd, Eu which may have peak iswavelength at about 557 nm.

In such an embodiment, part of the initial about 455 nm wavelengthemission light from the light emitting diode is absorbed by thephosphor, and it is converted to longer 2^(nd) wavelength. The 1^(st)and 2^(nd) light is mixed together and the desire emission is produced.As the shown FIG. 7, the light emitting device convert the 1^(st) bluelight of about 455 nm wavelength to wide spectral range of visiblelight, that is, white light, and at this time the color temperature isabout 4,000K to about 6,500K and CRI is about 86 to about 93.

The phosphor of the light emitting device according to the invention canbe applied by single chemical compound or mixture of plurality of singlechemical compound besides the embodiments in relation to FIG. 6 and FIG.7, which are explained above.

According to the description above, light emitting device with widerange of color temperature about 2,000K or about 8,000K or about 10,000Kand superior color rendering index more than about 90 can be realized byusing the lead and/or copper doped chemical compounds containing rareearth elements.

In such a wavelength conversion light emitting device is capable ofapplying on mobile phone, note book and electronic devices such as homeappliance, stereo, telecommunication products, but also for customdisplay's key pad and back light application. Moreover, it can beapplied for automobile, medical instrument and illumination products.

According to the invention, it is also able to provide a wavelengthconversion light emitting device with stability against water, humidity,vapor as well as other polar solvents.

In the foregoing described embodiments, various features are groupedtogether in a single embodiment for purposes of streamlining thedisclosure. This method of disclosure is not to be interpreted asreflecting an intention that the claimed invention requires morefeatures is than are expressly recited in each claim. Rather, as thefollowing claims reflect, inventive aspects lie in less than allfeatures of a single foregoing disclosed embodiment. Thus, the followingclaims are hereby incorporated into this Detailed Description ofEmbodiments, with each claim standing on its own as a separate preferredembodiment of the invention.

1. A light emitting device, comprising: a light emitting diodeconfigured to emit light; and a phosphor configured to change awavelength of the light emitted from the light emitting diode, thephosphor covering at least a portion of the light emitting diode;wherein said phosphor comprises a compound including a host material andan activator, and wherein divalent copper ions and oxygen are componentsof the host material.
 2. The light emitting device according to claim 1,wherein the compound has the formulaa(M′O)b(M″₂O)c(M″X)d(Al₂O₃)e(M′″O)f(M″″₂O₃)g(M′″″_(o)O_(p))h(M″″″_(x)O_(y))wherein M′ is Cu, or a combination of Cu and Pb; M″ is Li, Na, K, Rb,Cs, Au, Ag or any combination thereof; M′″ is Be, Mg, Ca, Sr, Ba, Zn,Cd, Mn or any combination thereof; M″′ is Sc, B, Ga, In, or anycombination thereof; M′″″ is Si, Ge, Ti, Zr, Mn, V, Nb, Ta, W, Mo, orany combination thereof; M″″″ is Bi, Sn, Sb, Sc, Y, La, Ce, Pr, Nd, Pm,Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, or any combination thereof; X isF, Cl, Br, I, or any combination thereof; 0<a≦2; 0≦b≦2; 0≦c≦2; 0<d≦8;0<e≦4; 0≦f≦3; 0≦g≦8; 0<h≦2; 1<o<2; 1≦p≦5; 1≦x≦2; and 1≦y≦5.
 3. The lightemitting device according to claim 1, wherein the compound has theformulaa(M′O)b(M″₂O)c(M″X)4-a-b-c(M′″O)7(Al₂O₃)d(B₂O₃)e(Ga₂O₃)f(SiO₂)g(GeO₂)h(M″″_(x)O_(y))wherein M′ is Cu, or a combination of Cu and Pb; M″ is Li, Na, K, Rb,Cs, Au, Ag, or any combination thereof; M′″ is Be, Mg, Ca, Sr, Ba, Zn,Cd, Mn, or any combination thereof; M″″ is Bi, Sn, Sb, Sc, Y, La, In,Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, or anycombination thereof; X is F, Cl, Br, I, or any combination thereof;0<a≦4; 0<b≦2; 0≦c≦2; 0≦d≦1; 0≦e≦1; 0≦f≦1; 0≦g≦1; 0<h≦2; 1≦x≦2; and1≦y≦5.
 4. The light emitting device according to claim 1, wherein thephosphor includes one or more single compounds or any combinationthereof.
 5. The light emitting device according to claim 1, furthercomprising a sealing material configured to cover the light emittingdiode and the phosphor.
 6. The light emitting device according to claim5, wherein the phosphor is distributed in the sealing material.
 7. Thelight emitting device according to claim 1, wherein the phosphor ismixed with a hardening material.
 8. The light emitting device accordingto claim 1, wherein the light emitting diode comprises a plurality oflight emitting diodes.
 9. The light emitting device according to claim1, wherein the phosphor comprises an aluminate containing copper, asilicate containing copper, an antimonite containing copper, a germanatecontaining copper, a germanate-silicate containing copper, a phosphatecontaining copper, or any combination thereof.
 10. The light emittingdevice according to claim 1, further comprising: a substrate; aplurality of electrodes provided on the substrate; and an electricallyconductive device configured to connect the light emitting diode withone of the plurality of electrodes, wherein the light emitting diode isprovided on another of the plurality of electrodes.
 11. The lightemitting device according to claim 10, further comprising electricallyconductive paste provided between the light emitting diode and one ofthe plurality of electrodes.
 12. The light emitting device according toclaim 10, further comprising a reflector configured to reflect the lightfrom the light emitting diode.
 13. The light emitting device accordingto claim 1, further comprising: a plurality of leads; a diode holderprovided at the end of one of the plurality of leads; and anelectrically conductive device configured to connect the light emittingdiode with another of the plurality of leads, wherein the light emittingdiode is provided in the diode holder and includes a plurality ofelectrodes.
 14. The light emitting device according to claim 13, furthercomprising electrically conductive paste provided between the lightemitting diode and one of the plurality of electrodes.
 15. The lightemitting device according to claim 1, further comprising: a housing; aheat sink at least partially provided in the housing; a plurality oflead frames provided on or around the heat sink; and an electricallyconductive device configured to connect the light emitting diode withone of the plurality of lead frames, wherein the light emitting diode isdisposed over the heat sink.
 16. The light emitting device according toclaim 15, further comprising electrically conductive paste providedbetween the light emitting diode and the heat sink.
 17. The lightemitting device according to claim 15, wherein at least one of theplurality of lead frames protrudes from the housing.
 18. The lightemitting device according to claim 15, wherein the heat sink comprises aplurality of heat sinks.
 19. The light emitting device according toclaim 1, lead is a component of the host material.